I am writing a book on Spaniards in the USSR who were repatriated during World War II and the Cold War.
On 22 August 1942, a small group of Spanish youth and their teacher was captured by the Wehrmacht in the Caucasus. They returned to Spain via Berlin in December 1942. I am seeking help with finding material in German archives. (I read and speak German.). I need to know which archives to consult and which finding aids to use.